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koruyucu
#1 Posted : Thursday, August 18, 2011 10:34:14 AM(UTC)
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I have hard time using views in layouts - when I call @Html.FrontHtml().RenderView("ViewName",ViewData) in layout Parameters property throws NullReference exception because PositionContext property of the Page_Context is not initialized. Is it 'by design'? If so, then how to pass parameters to view from layout?
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jifeng
#2 Posted : Friday, August 19, 2011 2:45:58 PM(UTC)
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Did you got the error on the page designer? It is no way to pass parameters to the view when you using the RenderView api.
Regards,

Jifeng Huang

Kooboo Team

Microsoft ASP.NET MVP
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MartinS
#3 Posted : Saturday, August 20, 2011 11:53:11 AM(UTC)
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If trying to pass variables between views, you could try storing information in Context.Items.

E.g.

Context.Items["Name"]=value;
var=Context.Items["Name"];
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koruyucu
#4 Posted : Tuesday, August 23, 2011 6:26:43 AM(UTC)
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to jifeng:
Nop, the view is being rendered in the layout and because it was accessing parameters it was giving error in runtime. Anyway i solved problem by constructing and passing new ViewDataDictionary to the View and view first checks parameters, then ViewData properties. Smth like this:
var positionContext = Page_Context.Current.PositionContext;
var parameterValue = (null != positionContext ? Page_Context.Current["paramname"] : null != this.ViewData ? this.ViewData["paramname"] : null) ?? "fallback value";
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ella
#5 Posted : Tuesday, March 27, 2012 11:30:44 AM(UTC)
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ella
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Example: I create a view with Parameter. I want to get this Parameter inside view plugin code. My plugin must give me some data depending on this parameter. Can I do this?
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jifeng
#6 Posted : Tuesday, March 27, 2012 1:48:37 PM(UTC)
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Hi ella:

it is impossible to get the view parameter in the plugins, because the plugins is run before the view is rendered.
Regards,

Jifeng Huang

Kooboo Team

Microsoft ASP.NET MVP
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ella
#7 Posted : Tuesday, March 27, 2012 2:02:45 PM(UTC)
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ella
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Location: Russia
jifeng wrote:
it is impossible to get the view parameter in the plugins, because the plugins is run before the view is rendered.

Can you tell me how to get the view parameter in the plugin?
In view I get it like this: @Page_Context.Current["param1"], but in plugin it doesn't work.
Sorry for my stupid questions :)
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jifeng
#8 Posted : Tuesday, March 27, 2012 2:21:00 PM(UTC)
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Sorry, it really impossible, because the parameter is populated when View is rendering. Please choose another way.
Regards,

Jifeng Huang

Kooboo Team

Microsoft ASP.NET MVP
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ella
#9 Posted : Tuesday, March 27, 2012 3:28:25 PM(UTC)
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ella
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Oh, my mistake. I thought you wrote "it is possible"... I not attentively read you previous message... %)
It is so a shame to me, sorry. Thanks for patience.
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Ethan
#10 Posted : Wednesday, May 09, 2012 12:41:45 PM(UTC)
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ella;5997 wrote:
Oh, my mistake. I thought you wrote "it is possible"... I not attentively read you previous message... %)
It is so a shame to me, sorry. Thanks for patience.


Hi Ella,
Why not add a plugin to the view? case you do that you can get view parameters in your plugin.

Page ----------> Page plugins
Layout ----------> Layout plugins
View ----------> View plugins

When I develop the view "ContactForm" I like add "ContactFormPlugin" to the view that way I can easy add the form data to my db.
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ella
#11 Posted : Wednesday, May 09, 2012 3:03:54 PM(UTC)
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ella
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Ethan;6130 wrote:

Hi Ella,
Why not add a plugin to the view? case you do that you can get view parameters in your plugin.

Page ----------> Page plugins
Layout ----------> Layout plugins
View ----------> View plugins

When I develop the view "ContactForm" I like add "ContactFormPlugin" to the view that way I can easy add the form data to my db.


Oh, I'm not sure that I understand your answer, Ethan.
My question was: "how to get the view parameter in the view plugin? In view I get it like this: @Page_Context.Current["param1"], but in plugin it doesn't work."

But jifeng answered me:
jifeng;5992 wrote:
it is impossible to get the view parameter in the plugins, because the plugins is run before the view is rendered.



If you know, how to do it, please write some example code.
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Ethan
#12 Posted : Thursday, May 10, 2012 6:13:42 AM(UTC)
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Hi Ella

1. Add DemoViewPlugin

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Web.Mvc;
using Kooboo.CMS.Toolkit;
using Kooboo.CMS.Toolkit.Plugins;

namespace Demo.Plugins
{
public class DemoViewPlugin : PluginBase
{
public override ActionResult Execute()
{
//Incorrect
//string uuids = PageContext["uuids"];

//Correct 1
string uuids = this.PagePositionContext["uuids"].Value.AsString();

// Correct 2
//string uuids = this.PagePositionContext.GetParameterValue<string>("uuids");
return null;
}
}
}

2. Add view "DemoView"
3. Add plugin "DemoViewPlugin" to "DemoView"
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1 user thanked Ethan for this useful post.
ella on 5/10/2012(UTC)
Ethan
#13 Posted : Thursday, May 10, 2012 6:14:24 AM(UTC)
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Btw add plugin to view not to page
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ella
#14 Posted : Thursday, May 10, 2012 7:13:08 AM(UTC)
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ella
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Joined: 6/30/2011(UTC)
Posts: 56
Location: Russia
Oh, greate! It's really works.
My mistake was - I used Page_Context, but I needed PagePositionContext. Thanks.

This is my code sample:

Code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Kooboo.CMS.Sites.Extension;
using Kooboo.CMS.Sites.View;
using System.Web.Mvc;

namespace Kooboo.CMS.PluginGetParam
{
    public class PluginGetParam : IPagePlugin
    {
        #region IPagePlugin Members

        public System.Web.Mvc.ActionResult Execute(Page_Context pageViewContext, PagePositionContext positionContext)
        {
            //Correct 1
            pageViewContext.ControllerContext.Controller.ViewData["sample1"] = positionContext["Group"].Value.ToString();

            // Correct 2
            pageViewContext.ControllerContext.Controller.ViewData["sample2"] = positionContext.GetParameterValue<string>("Group");

            return null;
        }

        #endregion

        public string Description
        {
            get { return "Sample plugin"; }
        }
    }
}


Why I needed this?! I want to create more usable plugin for several different pages.
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